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Humidifier filter removes minerals and pollutants from water. Filter discoloration is natural and will depend on the water. Replace the filter every two months (depending on use and quality of local waters) or when performance begins to deteriorate. Helps keep your humidifier clean and extend filter life by using accessories, Honeywell, including antibacterial treatment (HAC100). This helps control bacteria and algae in the water tank, and provides odor free operation for use in evaporative humidifiers only.
